垃圾渗滤液污染场地的重金属污染再释放研究

选用粉砂、粘土和土壤为材料,通过3个系列的静态实验研究了三种岩性的垃圾渗滤液污染场地中6种重金属污染再释放能力的时间变化趋势。实验结果表明,随着反应时间的延长,在模拟三种岩性的垃圾渗滤液污染场地中Cr、Cu、Mn、Ni、Zn的直接污染能力和污染再释放能力均有不同程度的增大,而Pb则不明显。其中,Cu和Mn在粉砂、粘土、土壤中的直接污染能力分别比背景值增大了4.8倍、2.3倍、3.1倍和24.8倍、22.9倍和2.5倍。Ni在粉砂中的直接污染能力比背景值增大了11倍。Zn在粉砂和粘土中的直接污染能力和污染再释放能力分别比背景值增大了1.4倍、1.7倍和1.4倍、1.5倍;Cu在三种介质中的污染再释放能力:土壤>>粉砂和粘土。Cu、Mn和Ni在三种介质中的直接污染能力:粉砂>>粘土和土壤。

Releasing of Heavy Metal Pollution in Landfill Leachate Contaminated Sites

Three series static experiments which selected silty sand,clay and soil as materials were done to investigate the special releasing capacity of heavy metals in three lithology landfill leachate contaminated sites. Experimental results indicated that the direct pollution capacity and releasing capacity of Cr,Cu,Mn,Ni and Zn increased in various degrees with reaction time went on,except Pb,with direct pollution capacity of Cu and Mn in silty sand,clay and soil increased 4.8 times,2.3 times,3.1 times and 24.8 times,22.9 times and 2.5 times respectively contrasting to their background values,direct pollution capacity of Ni in silty sand increased 11 times contrasting to its background value. The direct pollution capacity and releasing capacity of Zn in silty sand and clay increased 1.4 times,1.7 times and 1.4 times,1.5 times respectively contrasting to their background values. The releasing capacity of Cu in three lithology landfill contaminant sites is in the order of soil,silty sand and clay while Cu,Mn and Ni in the order of silty sand,clay and soil.